Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bcc0a9c4ec1bdee…

MALICIOUS

PDF

44.9 KB Created: 2020-08-12 04:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c71c0a04b49f5039fa8867a445d977e SHA-1: fa18efe39e0f9a544acc32018715a599d41a9d0e SHA-256: 6bcc0a9c4ec1bdee9c187f6dbe822dd5ce11b525e899f82161b1aa0c799559d9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a link farm designed to improve search engine rankings. One of the primary links, 'https://ttraff.ru/pify?keyword=cambridge+checkpoint+science+coursebook+7+pdf+free+download', is identified as a malicious redirector. This suggests the document is part of a phishing or scam campaign, attempting to direct users to malicious or unwanted content under the guise of providing free downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=cambridge+checkpoint+science+coursebook+7+pdf+free+download
    • http://files.davidjuliamusic.com/uploads/1/3/0/8/130874204/85aef08.pdf
    • http://files.suffolktrainstation.com/uploads/1/3/1/3/131379099/7810936.pdf
    • http://files.secretseeker.com/uploads/1/3/2/6/132682022/8451888.pdf
    • http://pukotejaz.rockyournails.org/uploads/1/3/1/0/131071157/2413488.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/3155/1400/files/ielts_speaking_part_2_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/4726/3128/files/93242815803.pdf
    • https://cdn.shopify.com/s/files/1/0434/5528/3350/files/dapavejonuni.pdf
    • https://cdn.shopify.com/s/files/1/0436/2525/0974/files/black_body_radiation_experiment.pdf
    • https://cdn.shopify.com/s/files/1/0434/4306/0901/files/323_736_5588.pdf
    • https://cdn.shopify.com/s/files/1/0432/7142/2102/files/51476890247.pdf
    • https://cdn.shopify.com/s/files/1/0439/6072/9758/files/somerville_ma_hourly_weather.pdf
    • https://cdn.shopify.com/s/files/1/0440/0958/6853/files/wikutede.pdf
    • https://cdn.shopify.com/s/files/1/0432/6768/6556/files/32534852897.pdf
    • https://cdn.shopify.com/s/files/1/0427/4959/1718/files/pepiputazawaga.pdf
    • https://cdn.shopify.com/s/files/1/0433/4593/6534/files/xizaworevisokiwusol.pdf
    • https://cdn.shopify.com/s/files/1/0428/3305/1814/files/kejezuzer.pdf
    • https://cdn.shopify.com/s/files/1/0429/1251/4201/files/11378972691.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061fa.bin
5031c009dcded92c2acc44eb9cb8a33fc324cf6c652176ea85c3829a79daf5c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61FA 5852 bytes
font_01_sfnt_off000075d9.bin
89de0c4725de93640c7b2ef17f82564e28aa3abf5317a7fba5725e8d8060db02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75D9 10048 bytes
font_02_sfnt_off0000983c.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x983C 4324 bytes

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